Initially, the entry barrier into the world of Angular development was pretty high because of the need to learn and manually configure multiple tools. Even to get started with a simple application, you’d need to learn the TypeScript language (an easy job for Java developers), learn how to configure and use the TypeScript compiler, ES6 modules, a module loader (e.g. SystemJS), test runners, npm, a dev web server. To work on a real-world project, you’d also need to learn how to test and bundle your app for deployment.